Water mass distribution and polar front structure in the western Barents Sea
Water mass distribution and polar front structure in the western Barents Sea
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DOI：
10.1029/97jc02790
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发表时间：
1998-02-15
影响因子：
3.6
通讯作者：
Gawarkiewicz, GG
中科院分区：
文献类型：
--
作者：
Harris, CL;Plueddemann, AJ;Gawarkiewicz, GG
本文根据历史水文资料分析了西巴伦支海的水团分布、西巴伦支海极锋的温盐结构和密集水团的局部形成。这项研究集中在Bjornoya和霍彭岛之间的锋面区域，在斯匹次卑尔根群岛沿岸发现北极水，在熊岛海槽和霍彭海沟发现大西洋水。与地形有关的大西洋和北极沃茨的分布与熊岛海槽和霍彭海沟内的大西洋水正压环流将极锋位置固定在250 m等深线附近的假设是一致的。在冬季，温度和盐度的垂直梯度弱整个锋区，符合正压，地形控制的前。在夏季，垂直梯度保持弱低于100米的深度，但增加了在上层作为一个结果的存在下，由融化的冰产生的新鲜，温暖的地表水。地形控制的温盐特性在表面被破坏的融水池，融水有助于在锋面区域的水团修改。以下的季节性循环的水团形成的假设：夏季加热融化海冰的斯匹次卑尔根银行和生产的表面融水池。这种融水不仅增加了垂直温盐梯度的银行，但也穿过前面和清新的表层整个西部巴伦支海。随后的冬季冷却，在岸边形成冰，也通过大西洋水和上覆融水的对流混合在熊岛海槽和霍彭海沟形成密集的水。
The water mass distribution in the western Barents Sea, the thermohaline structure of the western Barents Sea Polar Front, and the local formation of a dense water mass are described on the basis of an analysis of historical hydrographic data. This study concentrated on the frontal region between Bjornoya and Hopen Island where Arctic water is found on the Spitsbergen Bank and Atlantic water in the Bear Island Trough and Hopen Trench. The distributions of Atlantic and Arctic waters in relation to topography were consistent with the hypothesis that the location of the polar front is fixed at about the 250 m isobath by the barotropic circulation of Atlantic water within the Bear Island Trough and Hopen Trench. In winter, vertical gradients of temperature and salinity were weak throughout the frontal region, consistent with a barotropic, topographically controlled front. In summer, vertical gradients remained weak below 100 m depth but increased in the upper layer as a result of the presence of fresh, warm surface water produced by melting ice. The topographic control of thermohaline properties at the surface was disrupted by the meltwater pool, and the meltwater contributed to water mass modification in the frontal region. The following seasonal cycle of water mass formation was hypothesized: Summer heating melts the sea ice on the Spitsbergen Bank and produces the surface meltwater pool. This meltwater not only increases vertical thermohaline gradients on the bank but also crosses the front and freshens the surface layer throughout the western Barents Sea. Subsequent winter cooling, which creates ice over the bank, also forms dense water in the Bear Island Trough and Hopen Trench by convective mixing of Atlantic water and the overlying meltwater.